example usage:
tc filter add dev $dev parent $id: basic match not ipset'(foobar src)' ..
also updates iproute2/ematch_map, else tc complains:
Error: Unable to find ematch "ipset" in /etc/iproute2/ematch_map
Please assign a unique ID to the ematch kind the suggested entry is:
8 ipset
when trying to use this ematch.
(text ematch (5) only exists in kernel, a vlan ematch (6) exists neither in
kernel nor userspace, but kernel headers define TCF_EM_VLAN == 6).
